A shameless plug, but if you like HN and email, my side-project, http://www.hackernewsletter.com/, might be worth a look. Rolling past 50k subscribers this month.
That is 100% fair, but not an easy question to answer!
I curate by hand using a custom tool that helps me search/filter articles and basically find a mix of things I like along with things that subscribers tend to click on. I tend to avoid "click-bait" type articles with little substance and try to get a good mix of things that were popular with things that should of stayed on the home page more. I've been doing this for seven years now, so I feel like I have something that works... but ultimately you'll have to see if it fits what you're looking for. :)
